Pneumatic grinder



FIG. 1 is a perspective view of “a pneumatic grinder” showing my new design thereof;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front side elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a rear side elevational view thereof; and,

FIG. 8 is a perspective view in use.

The broken lines shown in the drawings form no part of the claimed design. 

The ornamental design for “a pneumatic grinder,” as shown and described. 